How to Filter a Dashboard in Salesforce
You can add a filter to a dashboard to control the data it contains. For example, if you have three sales offices you could create a single dashboard with filters for each office, instead of having to create three separate dashboards.
Next you need to specify the fields you want to use to filter the dashboard.
Components in the dashboard are often based on different Salesforce objects.
A new Filter By list appears at the top of the dashboard.
Salesforce applies the filter and only shows records that fit your specifications.
You can edit or delete a filter by editing the dashboard.
All your filters will appear at the top of the dashboard.